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Title: Hardness, elastic, and electronic properties of chromium monoboride

We report high-pressure synthesis of chromium monoboride (CrB) at 6 GPa and 1400 K. The elastic and plastic behaviors have been investigated by hydrostatic compression experiment and micro-indentation measurement. CrB is elastically incompressible with a high bulk modulus of 269.0 (5.9) GPa and exhibits a high Vickers hardness of 19.6 (0.7) GPa under the load of 1 kg force. Based on first principles calculations, the observed mechanical properties are attributed to the polar covalent Cr-B bonds interconnected with strong zigzag B-B covalent bonding network. The presence of metallic Cr bilayers is presumably responsible for the weakest paths in shear deformation.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ; ; ; ; ; ; ;  [1] ;  [5] ;  [6] ;  [7] ;  [1] ;  [8]
  1. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  2. (China)
  3. HiPSEC and Department of Physics, University of Nevada, Las Vegas, Nevada 89154 (United States)
  4. Neutron Scattering Laboratory, China Institute of Atomic Energy, Beijing 102413 (China)
  5. College of Construction Engineering, Jilin University, Changchun, Jilin 130061 (China)
  6. School of Materials Science and Engineering, Beihang University, Beijing 100191 (China)
  7. LANSCE Division, Los Alamos National Lab, Los Alamos, New Mexico 87545 (United States)
  8. (United States)
Publication Date:
OSTI Identifier:
22415100
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHROMIUM BORIDES; COVALENCE; DEFORMATION; HARDNESS; LAYERS; PRESSURE RANGE GIGA PA; SHEAR; TEMPERATURE RANGE 1000-4000 K; VICKERS HARDNESS